1 /* 2 * Silicon Laboratories CP210x USB to RS232 serial adaptor driver 3 * 4 * Copyright (C) 2005 Craig Shelley (craig@microtron.org.uk) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 8 * 2 as published by the Free Software Foundation. 9 * 10 * Support to set flow control line levels using TIOCMGET and TIOCMSET 11 * thanks to Karl Hiramoto karl@hiramoto.org. RTSCTS hardware flow 12 * control thanks to Munir Nassar nassarmu@real-time.com 13 * 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/errno.h> 18 #include <linux/slab.h> 19 #include <linux/tty.h> 20 #include <linux/tty_flip.h> 21 #include <linux/module.h> 22 #include <linux/moduleparam.h> 23 #include <linux/usb.h> 24 #include <linux/uaccess.h> 25 #include <linux/usb/serial.h> 26 27 #define DRIVER_DESC "Silicon Labs CP210x RS232 serial adaptor driver" 28 29 /* 30 * Function Prototypes 31 */ 32 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *); 33 static void cp210x_close(struct usb_serial_port *); 34 static void cp210x_get_termios(struct tty_struct *, struct usb_serial_port *); 35 static void cp210x_get_termios_port(struct usb_serial_port *port, 36 unsigned int *cflagp, unsigned int *baudp); 37 static void cp210x_change_speed(struct tty_struct *, struct usb_serial_port *, 38 struct ktermios *); 39 static void cp210x_set_termios(struct tty_struct *, struct usb_serial_port *, 40 struct ktermios*); 41 static bool cp210x_tx_empty(struct usb_serial_port *port); 42 static int cp210x_tiocmget(struct tty_struct *); 43 static int cp210x_tiocmset(struct tty_struct *, unsigned int, unsigned int); 44 static int cp210x_tiocmset_port(struct usb_serial_port *port, 45 unsigned int, unsigned int); 46 static void cp210x_break_ctl(struct tty_struct *, int); 47 static int cp210x_port_probe(struct usb_serial_port *); 48 static int cp210x_port_remove(struct usb_serial_port *); 49 static void cp210x_dtr_rts(struct usb_serial_port *p, int on); 50 51 static const struct usb_device_id id_table[] = { 52 { USB_DEVICE(0x045B, 0x0053) }, /* Renesas RX610 RX-Stick */ 53 { USB_DEVICE(0x0471, 0x066A) }, /* AKTAKOM ACE-1001 cable */ 54 { USB_DEVICE(0x0489, 0xE000) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 55 { USB_DEVICE(0x0489, 0xE003) }, /* Pirelli Broadband S.p.A, DP-L10 SIP/GSM Mobile */ 56 { USB_DEVICE(0x0745, 0x1000) }, /* CipherLab USB CCD Barcode Scanner 1000 */ 57 { USB_DEVICE(0x0846, 0x1100) }, /* NetGear Managed Switch M4100 series, M5300 series, M7100 series */ 58 { USB_DEVICE(0x08e6, 0x5501) }, /* Gemalto Prox-PU/CU contactless smartcard reader */ 59 { USB_DEVICE(0x08FD, 0x000A) }, /* Digianswer A/S , ZigBee/802.15.4 MAC Device */ 60 { USB_DEVICE(0x0908, 0x01FF) }, /* Siemens RUGGEDCOM USB Serial Console */ 61 { USB_DEVICE(0x0BED, 0x1100) }, /* MEI (TM) Cashflow-SC Bill/Voucher Acceptor */ 62 { USB_DEVICE(0x0BED, 0x1101) }, /* MEI series 2000 Combo Acceptor */ 63 { USB_DEVICE(0x0FCF, 0x1003) }, /* Dynastream ANT development board */ 64 { USB_DEVICE(0x0FCF, 0x1004) }, /* Dynastream ANT2USB */ 65 { USB_DEVICE(0x0FCF, 0x1006) }, /* Dynastream ANT development board */ 66 { USB_DEVICE(0x0FDE, 0xCA05) }, /* OWL Wireless Electricity Monitor CM-160 */ 67 { USB_DEVICE(0x10A6, 0xAA26) }, /* Knock-off DCU-11 cable */ 68 { USB_DEVICE(0x10AB, 0x10C5) }, /* Siemens MC60 Cable */ 69 { USB_DEVICE(0x10B5, 0xAC70) }, /* Nokia CA-42 USB */ 70 { USB_DEVICE(0x10C4, 0x0F91) }, /* Vstabi */ 71 { USB_DEVICE(0x10C4, 0x1101) }, /* Arkham Technology DS101 Bus Monitor */ 72 { USB_DEVICE(0x10C4, 0x1601) }, /* Arkham Technology DS101 Adapter */ 73 { USB_DEVICE(0x10C4, 0x800A) }, /* SPORTident BSM7-D-USB main station */ 74 { USB_DEVICE(0x10C4, 0x803B) }, /* Pololu USB-serial converter */ 75 { USB_DEVICE(0x10C4, 0x8044) }, /* Cygnal Debug Adapter */ 76 { USB_DEVICE(0x10C4, 0x804E) }, /* Software Bisque Paramount ME build-in converter */ 77 { USB_DEVICE(0x10C4, 0x8053) }, /* Enfora EDG1228 */ 78 { USB_DEVICE(0x10C4, 0x8054) }, /* Enfora GSM2228 */ 79 { USB_DEVICE(0x10C4, 0x8066) }, /* Argussoft In-System Programmer */ 80 { USB_DEVICE(0x10C4, 0x806F) }, /* IMS USB to RS422 Converter Cable */ 81 { USB_DEVICE(0x10C4, 0x807A) }, /* Crumb128 board */ 82 { USB_DEVICE(0x10C4, 0x80C4) }, /* Cygnal Integrated Products, Inc., Optris infrared thermometer */ 83 { USB_DEVICE(0x10C4, 0x80CA) }, /* Degree Controls Inc */ 84 { USB_DEVICE(0x10C4, 0x80DD) }, /* Tracient RFID */ 85 { USB_DEVICE(0x10C4, 0x80F6) }, /* Suunto sports instrument */ 86 { USB_DEVICE(0x10C4, 0x8115) }, /* Arygon NFC/Mifare Reader */ 87 { USB_DEVICE(0x10C4, 0x813D) }, /* Burnside Telecom Deskmobile */ 88 { USB_DEVICE(0x10C4, 0x813F) }, /* Tams Master Easy Control */ 89 { USB_DEVICE(0x10C4, 0x814A) }, /* West Mountain Radio RIGblaster P&P */ 90 { USB_DEVICE(0x10C4, 0x814B) }, /* West Mountain Radio RIGtalk */ 91 { USB_DEVICE(0x2405, 0x0003) }, /* West Mountain Radio RIGblaster Advantage */ 92 { USB_DEVICE(0x10C4, 0x8156) }, /* B&G H3000 link cable */ 93 { USB_DEVICE(0x10C4, 0x815E) }, /* Helicomm IP-Link 1220-DVM */ 94 { USB_DEVICE(0x10C4, 0x815F) }, /* Timewave HamLinkUSB */ 95 { USB_DEVICE(0x10C4, 0x818B) }, /* AVIT Research USB to TTL */ 96 { USB_DEVICE(0x10C4, 0x819F) }, /* MJS USB Toslink Switcher */ 97 { USB_DEVICE(0x10C4, 0x81A6) }, /* ThinkOptics WavIt */ 98 { USB_DEVICE(0x10C4, 0x81A9) }, /* Multiplex RC Interface */ 99 { USB_DEVICE(0x10C4, 0x81AC) }, /* MSD Dash Hawk */ 100 { USB_DEVICE(0x10C4, 0x81AD) }, /* INSYS USB Modem */ 101 { USB_DEVICE(0x10C4, 0x81C8) }, /* Lipowsky Industrie Elektronik GmbH, Baby-JTAG */ 102 { USB_DEVICE(0x10C4, 0x81E2) }, /* Lipowsky Industrie Elektronik GmbH, Baby-LIN */ 103 { USB_DEVICE(0x10C4, 0x81E7) }, /* Aerocomm Radio */ 104 { USB_DEVICE(0x10C4, 0x81E8) }, /* Zephyr Bioharness */ 105 { USB_DEVICE(0x10C4, 0x81F2) }, /* C1007 HF band RFID controller */ 106 { USB_DEVICE(0x10C4, 0x8218) }, /* Lipowsky Industrie Elektronik GmbH, HARP-1 */ 107 { USB_DEVICE(0x10C4, 0x822B) }, /* Modem EDGE(GSM) Comander 2 */ 108 { USB_DEVICE(0x10C4, 0x826B) }, /* Cygnal Integrated Products, Inc., Fasttrax GPS demonstration module */ 109 { USB_DEVICE(0x10C4, 0x8281) }, /* Nanotec Plug & Drive */ 110 { USB_DEVICE(0x10C4, 0x8293) }, /* Telegesis ETRX2USB */ 111 { USB_DEVICE(0x10C4, 0x82F9) }, /* Procyon AVS */ 112 { USB_DEVICE(0x10C4, 0x8341) }, /* Siemens MC35PU GPRS Modem */ 113 { USB_DEVICE(0x10C4, 0x8382) }, /* Cygnal Integrated Products, Inc. */ 114 { USB_DEVICE(0x10C4, 0x83A8) }, /* Amber Wireless AMB2560 */ 115 { USB_DEVICE(0x10C4, 0x83D8) }, /* DekTec DTA Plus VHF/UHF Booster/Attenuator */ 116 { USB_DEVICE(0x10C4, 0x8411) }, /* Kyocera GPS Module */ 117 { USB_DEVICE(0x10C4, 0x8418) }, /* IRZ Automation Teleport SG-10 GSM/GPRS Modem */ 118 { USB_DEVICE(0x10C4, 0x846E) }, /* BEI USB Sensor Interface (VCP) */ 119 { USB_DEVICE(0x10C4, 0x8477) }, /* Balluff RFID */ 120 { USB_DEVICE(0x10C4, 0x85EA) }, /* AC-Services IBUS-IF */ 121 { USB_DEVICE(0x10C4, 0x85EB) }, /* AC-Services CIS-IBUS */ 122 { USB_DEVICE(0x10C4, 0x85F8) }, /* Virtenio Preon32 */ 123 { USB_DEVICE(0x10C4, 0x8664) }, /* AC-Services CAN-IF */ 124 { USB_DEVICE(0x10C4, 0x8665) }, /* AC-Services OBD-IF */ 125 { USB_DEVICE(0x10C4, 0x8856) }, /* CEL EM357 ZigBee USB Stick - LR */ 126 { USB_DEVICE(0x10C4, 0x8857) }, /* CEL EM357 ZigBee USB Stick */ 127 { USB_DEVICE(0x10C4, 0x88A4) }, /* MMB Networks ZigBee USB Device */ 128 { USB_DEVICE(0x10C4, 0x88A5) }, /* Planet Innovation Ingeni ZigBee USB Device */ 129 { USB_DEVICE(0x10C4, 0x8946) }, /* Ketra N1 Wireless Interface */ 130 { USB_DEVICE(0x10C4, 0x8977) }, /* CEL MeshWorks DevKit Device */ 131 { USB_DEVICE(0x10C4, 0x8998) }, /* KCF Technologies PRN */ 132 { USB_DEVICE(0x10C4, 0x8A2A) }, /* HubZ dual ZigBee and Z-Wave dongle */ 133 { USB_DEVICE(0x10C4, 0xEA60) }, /* Silicon Labs factory default */ 134 { USB_DEVICE(0x10C4, 0xEA61) }, /* Silicon Labs factory default */ 135 { USB_DEVICE(0x10C4, 0xEA70) }, /* Silicon Labs factory default */ 136 { USB_DEVICE(0x10C4, 0xEA80) }, /* Silicon Labs factory default */ 137 { USB_DEVICE(0x10C4, 0xEA71) }, /* Infinity GPS-MIC-1 Radio Monophone */ 138 { USB_DEVICE(0x10C4, 0xF001) }, /* Elan Digital Systems USBscope50 */ 139 { USB_DEVICE(0x10C4, 0xF002) }, /* Elan Digital Systems USBwave12 */ 140 { USB_DEVICE(0x10C4, 0xF003) }, /* Elan Digital Systems USBpulse100 */ 141 { USB_DEVICE(0x10C4, 0xF004) }, /* Elan Digital Systems USBcount50 */ 142 { USB_DEVICE(0x10C5, 0xEA61) }, /* Silicon Labs MobiData GPRS USB Modem */ 143 { USB_DEVICE(0x10CE, 0xEA6A) }, /* Silicon Labs MobiData GPRS USB Modem 100EU */ 144 { USB_DEVICE(0x13AD, 0x9999) }, /* Baltech card reader */ 145 { USB_DEVICE(0x1555, 0x0004) }, /* Owen AC4 USB-RS485 Converter */ 146 { USB_DEVICE(0x166A, 0x0201) }, /* Clipsal 5500PACA C-Bus Pascal Automation Controller */ 147 { USB_DEVICE(0x166A, 0x0301) }, /* Clipsal 5800PC C-Bus Wireless PC Interface */ 148 { USB_DEVICE(0x166A, 0x0303) }, /* Clipsal 5500PCU C-Bus USB interface */ 149 { USB_DEVICE(0x166A, 0x0304) }, /* Clipsal 5000CT2 C-Bus Black and White Touchscreen */ 150 { USB_DEVICE(0x166A, 0x0305) }, /* Clipsal C-5000CT2 C-Bus Spectrum Colour Touchscreen */ 151 { USB_DEVICE(0x166A, 0x0401) }, /* Clipsal L51xx C-Bus Architectural Dimmer */ 152 { USB_DEVICE(0x166A, 0x0101) }, /* Clipsal 5560884 C-Bus Multi-room Audio Matrix Switcher */ 153 { USB_DEVICE(0x16C0, 0x09B0) }, /* Lunatico Seletek */ 154 { USB_DEVICE(0x16C0, 0x09B1) }, /* Lunatico Seletek */ 155 { USB_DEVICE(0x16D6, 0x0001) }, /* Jablotron serial interface */ 156 { USB_DEVICE(0x16DC, 0x0010) }, /* W-IE-NE-R Plein & Baus GmbH PL512 Power Supply */ 157 { USB_DEVICE(0x16DC, 0x0011) }, /* W-IE-NE-R Plein & Baus GmbH RCM Remote Control for MARATON Power Supply */ 158 { USB_DEVICE(0x16DC, 0x0012) }, /* W-IE-NE-R Plein & Baus GmbH MPOD Multi Channel Power Supply */ 159 { USB_DEVICE(0x16DC, 0x0015) }, /* W-IE-NE-R Plein & Baus GmbH CML Control, Monitoring and Data Logger */ 160 { USB_DEVICE(0x17A8, 0x0001) }, /* Kamstrup Optical Eye/3-wire */ 161 { USB_DEVICE(0x17A8, 0x0005) }, /* Kamstrup M-Bus Master MultiPort 250D */ 162 { USB_DEVICE(0x17F4, 0xAAAA) }, /* Wavesense Jazz blood glucose meter */ 163 { USB_DEVICE(0x1843, 0x0200) }, /* Vaisala USB Instrument Cable */ 164 { USB_DEVICE(0x18EF, 0xE00F) }, /* ELV USB-I2C-Interface */ 165 { USB_DEVICE(0x1ADB, 0x0001) }, /* Schweitzer Engineering C662 Cable */ 166 { USB_DEVICE(0x1B1C, 0x1C00) }, /* Corsair USB Dongle */ 167 { USB_DEVICE(0x1BA4, 0x0002) }, /* Silicon Labs 358x factory default */ 168 { USB_DEVICE(0x1BE3, 0x07A6) }, /* WAGO 750-923 USB Service Cable */ 169 { USB_DEVICE(0x1D6F, 0x0010) }, /* Seluxit ApS RF Dongle */ 170 { USB_DEVICE(0x1E29, 0x0102) }, /* Festo CPX-USB */ 171 { USB_DEVICE(0x1E29, 0x0501) }, /* Festo CMSP */ 172 { USB_DEVICE(0x1FB9, 0x0100) }, /* Lake Shore Model 121 Current Source */ 173 { USB_DEVICE(0x1FB9, 0x0200) }, /* Lake Shore Model 218A Temperature Monitor */ 174 { USB_DEVICE(0x1FB9, 0x0201) }, /* Lake Shore Model 219 Temperature Monitor */ 175 { USB_DEVICE(0x1FB9, 0x0202) }, /* Lake Shore Model 233 Temperature Transmitter */ 176 { USB_DEVICE(0x1FB9, 0x0203) }, /* Lake Shore Model 235 Temperature Transmitter */ 177 { USB_DEVICE(0x1FB9, 0x0300) }, /* Lake Shore Model 335 Temperature Controller */ 178 { USB_DEVICE(0x1FB9, 0x0301) }, /* Lake Shore Model 336 Temperature Controller */ 179 { USB_DEVICE(0x1FB9, 0x0302) }, /* Lake Shore Model 350 Temperature Controller */ 180 { USB_DEVICE(0x1FB9, 0x0303) }, /* Lake Shore Model 371 AC Bridge */ 181 { USB_DEVICE(0x1FB9, 0x0400) }, /* Lake Shore Model 411 Handheld Gaussmeter */ 182 { USB_DEVICE(0x1FB9, 0x0401) }, /* Lake Shore Model 425 Gaussmeter */ 183 { USB_DEVICE(0x1FB9, 0x0402) }, /* Lake Shore Model 455A Gaussmeter */ 184 { USB_DEVICE(0x1FB9, 0x0403) }, /* Lake Shore Model 475A Gaussmeter */ 185 { USB_DEVICE(0x1FB9, 0x0404) }, /* Lake Shore Model 465 Three Axis Gaussmeter */ 186 { USB_DEVICE(0x1FB9, 0x0600) }, /* Lake Shore Model 625A Superconducting MPS */ 187 { USB_DEVICE(0x1FB9, 0x0601) }, /* Lake Shore Model 642A Magnet Power Supply */ 188 { USB_DEVICE(0x1FB9, 0x0602) }, /* Lake Shore Model 648 Magnet Power Supply */ 189 { USB_DEVICE(0x1FB9, 0x0700) }, /* Lake Shore Model 737 VSM Controller */ 190 { USB_DEVICE(0x1FB9, 0x0701) }, /* Lake Shore Model 776 Hall Matrix */ 191 { USB_DEVICE(0x2626, 0xEA60) }, /* Aruba Networks 7xxx USB Serial Console */ 192 { USB_DEVICE(0x3195, 0xF190) }, /* Link Instruments MSO-19 */ 193 { USB_DEVICE(0x3195, 0xF280) }, /* Link Instruments MSO-28 */ 194 { USB_DEVICE(0x3195, 0xF281) }, /* Link Instruments MSO-28 */ 195 { USB_DEVICE(0x413C, 0x9500) }, /* DW700 GPS USB interface */ 196 { } /* Terminating Entry */ 197 }; 198 199 MODULE_DEVICE_TABLE(usb, id_table); 200 201 struct cp210x_port_private { 202 __u8 bInterfaceNumber; 203 bool has_swapped_line_ctl; 204 }; 205 206 static struct usb_serial_driver cp210x_device = { 207 .driver = { 208 .owner = THIS_MODULE, 209 .name = "cp210x", 210 }, 211 .id_table = id_table, 212 .num_ports = 1, 213 .bulk_in_size = 256, 214 .bulk_out_size = 256, 215 .open = cp210x_open, 216 .close = cp210x_close, 217 .break_ctl = cp210x_break_ctl, 218 .set_termios = cp210x_set_termios, 219 .tx_empty = cp210x_tx_empty, 220 .tiocmget = cp210x_tiocmget, 221 .tiocmset = cp210x_tiocmset, 222 .port_probe = cp210x_port_probe, 223 .port_remove = cp210x_port_remove, 224 .dtr_rts = cp210x_dtr_rts 225 }; 226 227 static struct usb_serial_driver * const serial_drivers[] = { 228 &cp210x_device, NULL 229 }; 230 231 /* Config request types */ 232 #define REQTYPE_HOST_TO_INTERFACE 0x41 233 #define REQTYPE_INTERFACE_TO_HOST 0xc1 234 #define REQTYPE_HOST_TO_DEVICE 0x40 235 #define REQTYPE_DEVICE_TO_HOST 0xc0 236 237 /* Config request codes */ 238 #define CP210X_IFC_ENABLE 0x00 239 #define CP210X_SET_BAUDDIV 0x01 240 #define CP210X_GET_BAUDDIV 0x02 241 #define CP210X_SET_LINE_CTL 0x03 242 #define CP210X_GET_LINE_CTL 0x04 243 #define CP210X_SET_BREAK 0x05 244 #define CP210X_IMM_CHAR 0x06 245 #define CP210X_SET_MHS 0x07 246 #define CP210X_GET_MDMSTS 0x08 247 #define CP210X_SET_XON 0x09 248 #define CP210X_SET_XOFF 0x0A 249 #define CP210X_SET_EVENTMASK 0x0B 250 #define CP210X_GET_EVENTMASK 0x0C 251 #define CP210X_SET_CHAR 0x0D 252 #define CP210X_GET_CHARS 0x0E 253 #define CP210X_GET_PROPS 0x0F 254 #define CP210X_GET_COMM_STATUS 0x10 255 #define CP210X_RESET 0x11 256 #define CP210X_PURGE 0x12 257 #define CP210X_SET_FLOW 0x13 258 #define CP210X_GET_FLOW 0x14 259 #define CP210X_EMBED_EVENTS 0x15 260 #define CP210X_GET_EVENTSTATE 0x16 261 #define CP210X_SET_CHARS 0x19 262 #define CP210X_GET_BAUDRATE 0x1D 263 #define CP210X_SET_BAUDRATE 0x1E 264 265 /* CP210X_IFC_ENABLE */ 266 #define UART_ENABLE 0x0001 267 #define UART_DISABLE 0x0000 268 269 /* CP210X_(SET|GET)_BAUDDIV */ 270 #define BAUD_RATE_GEN_FREQ 0x384000 271 272 /* CP210X_(SET|GET)_LINE_CTL */ 273 #define BITS_DATA_MASK 0X0f00 274 #define BITS_DATA_5 0X0500 275 #define BITS_DATA_6 0X0600 276 #define BITS_DATA_7 0X0700 277 #define BITS_DATA_8 0X0800 278 #define BITS_DATA_9 0X0900 279 280 #define BITS_PARITY_MASK 0x00f0 281 #define BITS_PARITY_NONE 0x0000 282 #define BITS_PARITY_ODD 0x0010 283 #define BITS_PARITY_EVEN 0x0020 284 #define BITS_PARITY_MARK 0x0030 285 #define BITS_PARITY_SPACE 0x0040 286 287 #define BITS_STOP_MASK 0x000f 288 #define BITS_STOP_1 0x0000 289 #define BITS_STOP_1_5 0x0001 290 #define BITS_STOP_2 0x0002 291 292 /* CP210X_SET_BREAK */ 293 #define BREAK_ON 0x0001 294 #define BREAK_OFF 0x0000 295 296 /* CP210X_(SET_MHS|GET_MDMSTS) */ 297 #define CONTROL_DTR 0x0001 298 #define CONTROL_RTS 0x0002 299 #define CONTROL_CTS 0x0010 300 #define CONTROL_DSR 0x0020 301 #define CONTROL_RING 0x0040 302 #define CONTROL_DCD 0x0080 303 #define CONTROL_WRITE_DTR 0x0100 304 #define CONTROL_WRITE_RTS 0x0200 305 306 /* CP210X_GET_COMM_STATUS returns these 0x13 bytes */ 307 struct cp210x_comm_status { 308 __le32 ulErrors; 309 __le32 ulHoldReasons; 310 __le32 ulAmountInInQueue; 311 __le32 ulAmountInOutQueue; 312 u8 bEofReceived; 313 u8 bWaitForImmediate; 314 u8 bReserved; 315 } __packed; 316 317 /* 318 * CP210X_PURGE - 16 bits passed in wValue of USB request. 319 * SiLabs app note AN571 gives a strange description of the 4 bits: 320 * bit 0 or bit 2 clears the transmit queue and 1 or 3 receive. 321 * writing 1 to all, however, purges cp2108 well enough to avoid the hang. 322 */ 323 #define PURGE_ALL 0x000f 324 325 /* 326 * cp210x_get_config 327 * Reads from the CP210x configuration registers 328 * 'size' is specified in bytes. 329 * 'data' is a pointer to a pre-allocated array of integers large 330 * enough to hold 'size' bytes (with 4 bytes to each integer) 331 */ 332 static int cp210x_get_config(struct usb_serial_port *port, u8 request, 333 unsigned int *data, int size) 334 { 335 struct usb_serial *serial = port->serial; 336 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 337 __le32 *buf; 338 int result, i, length; 339 340 /* Number of integers required to contain the array */ 341 length = (((size - 1) | 3) + 1) / 4; 342 343 buf = kcalloc(length, sizeof(__le32), GFP_KERNEL); 344 if (!buf) 345 return -ENOMEM; 346 347 /* Issue the request, attempting to read 'size' bytes */ 348 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 349 request, REQTYPE_INTERFACE_TO_HOST, 0x0000, 350 port_priv->bInterfaceNumber, buf, size, 351 USB_CTRL_GET_TIMEOUT); 352 353 /* Convert data into an array of integers */ 354 for (i = 0; i < length; i++) 355 data[i] = le32_to_cpu(buf[i]); 356 357 kfree(buf); 358 359 if (result != size) { 360 dev_dbg(&port->dev, "%s - Unable to send config request, request=0x%x size=%d result=%d\n", 361 __func__, request, size, result); 362 if (result > 0) 363 result = -EPROTO; 364 365 return result; 366 } 367 368 return 0; 369 } 370 371 /* 372 * cp210x_set_config 373 * Writes to the CP210x configuration registers 374 * Values less than 16 bits wide are sent directly 375 * 'size' is specified in bytes. 376 */ 377 static int cp210x_set_config(struct usb_serial_port *port, u8 request, 378 unsigned int *data, int size) 379 { 380 struct usb_serial *serial = port->serial; 381 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 382 __le32 *buf; 383 int result, i, length; 384 385 /* Number of integers required to contain the array */ 386 length = (((size - 1) | 3) + 1) / 4; 387 388 buf = kmalloc(length * sizeof(__le32), GFP_KERNEL); 389 if (!buf) 390 return -ENOMEM; 391 392 /* Array of integers into bytes */ 393 for (i = 0; i < length; i++) 394 buf[i] = cpu_to_le32(data[i]); 395 396 if (size > 2) { 397 result = usb_control_msg(serial->dev, 398 usb_sndctrlpipe(serial->dev, 0), 399 request, REQTYPE_HOST_TO_INTERFACE, 0x0000, 400 port_priv->bInterfaceNumber, buf, size, 401 USB_CTRL_SET_TIMEOUT); 402 } else { 403 result = usb_control_msg(serial->dev, 404 usb_sndctrlpipe(serial->dev, 0), 405 request, REQTYPE_HOST_TO_INTERFACE, data[0], 406 port_priv->bInterfaceNumber, NULL, 0, 407 USB_CTRL_SET_TIMEOUT); 408 } 409 410 kfree(buf); 411 412 if ((size > 2 && result != size) || result < 0) { 413 dev_dbg(&port->dev, "%s - Unable to send request, request=0x%x size=%d result=%d\n", 414 __func__, request, size, result); 415 if (result > 0) 416 result = -EPROTO; 417 418 return result; 419 } 420 421 return 0; 422 } 423 424 /* 425 * cp210x_set_config_single 426 * Convenience function for calling cp210x_set_config on single data values 427 * without requiring an integer pointer 428 */ 429 static inline int cp210x_set_config_single(struct usb_serial_port *port, 430 u8 request, unsigned int data) 431 { 432 return cp210x_set_config(port, request, &data, 2); 433 } 434 435 /* 436 * Detect CP2108 GET_LINE_CTL bug and activate workaround. 437 * Write a known good value 0x800, read it back. 438 * If it comes back swapped the bug is detected. 439 * Preserve the original register value. 440 */ 441 static int cp210x_detect_swapped_line_ctl(struct usb_serial_port *port) 442 { 443 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 444 unsigned int line_ctl_save; 445 unsigned int line_ctl_test; 446 int err; 447 448 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_save, 2); 449 if (err) 450 return err; 451 452 line_ctl_test = 0x800; 453 err = cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_test, 2); 454 if (err) 455 return err; 456 457 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, &line_ctl_test, 2); 458 if (err) 459 return err; 460 461 if (line_ctl_test == 8) { 462 port_priv->has_swapped_line_ctl = true; 463 line_ctl_save = swab16((u16)line_ctl_save); 464 } 465 466 return cp210x_set_config(port, CP210X_SET_LINE_CTL, &line_ctl_save, 2); 467 } 468 469 /* 470 * Must always be called instead of cp210x_get_config(CP210X_GET_LINE_CTL) 471 * to workaround cp2108 bug and get correct value. 472 */ 473 static int cp210x_get_line_ctl(struct usb_serial_port *port, unsigned int *ctl) 474 { 475 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 476 int err; 477 478 err = cp210x_get_config(port, CP210X_GET_LINE_CTL, ctl, 2); 479 if (err) 480 return err; 481 482 /* Workaround swapped bytes in 16-bit value from CP210X_GET_LINE_CTL */ 483 if (port_priv->has_swapped_line_ctl) 484 *ctl = swab16((u16)(*ctl)); 485 486 return 0; 487 } 488 489 /* 490 * cp210x_quantise_baudrate 491 * Quantises the baud rate as per AN205 Table 1 492 */ 493 static unsigned int cp210x_quantise_baudrate(unsigned int baud) 494 { 495 if (baud <= 300) 496 baud = 300; 497 else if (baud <= 600) baud = 600; 498 else if (baud <= 1200) baud = 1200; 499 else if (baud <= 1800) baud = 1800; 500 else if (baud <= 2400) baud = 2400; 501 else if (baud <= 4000) baud = 4000; 502 else if (baud <= 4803) baud = 4800; 503 else if (baud <= 7207) baud = 7200; 504 else if (baud <= 9612) baud = 9600; 505 else if (baud <= 14428) baud = 14400; 506 else if (baud <= 16062) baud = 16000; 507 else if (baud <= 19250) baud = 19200; 508 else if (baud <= 28912) baud = 28800; 509 else if (baud <= 38601) baud = 38400; 510 else if (baud <= 51558) baud = 51200; 511 else if (baud <= 56280) baud = 56000; 512 else if (baud <= 58053) baud = 57600; 513 else if (baud <= 64111) baud = 64000; 514 else if (baud <= 77608) baud = 76800; 515 else if (baud <= 117028) baud = 115200; 516 else if (baud <= 129347) baud = 128000; 517 else if (baud <= 156868) baud = 153600; 518 else if (baud <= 237832) baud = 230400; 519 else if (baud <= 254234) baud = 250000; 520 else if (baud <= 273066) baud = 256000; 521 else if (baud <= 491520) baud = 460800; 522 else if (baud <= 567138) baud = 500000; 523 else if (baud <= 670254) baud = 576000; 524 else if (baud < 1000000) 525 baud = 921600; 526 else if (baud > 2000000) 527 baud = 2000000; 528 return baud; 529 } 530 531 static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port) 532 { 533 int result; 534 535 result = cp210x_set_config_single(port, CP210X_IFC_ENABLE, 536 UART_ENABLE); 537 if (result) { 538 dev_err(&port->dev, "%s - Unable to enable UART\n", __func__); 539 return result; 540 } 541 542 /* Configure the termios structure */ 543 cp210x_get_termios(tty, port); 544 545 /* The baud rate must be initialised on cp2104 */ 546 if (tty) 547 cp210x_change_speed(tty, port, NULL); 548 549 return usb_serial_generic_open(tty, port); 550 } 551 552 static void cp210x_close(struct usb_serial_port *port) 553 { 554 unsigned int purge_ctl; 555 556 usb_serial_generic_close(port); 557 558 /* Clear both queues; cp2108 needs this to avoid an occasional hang */ 559 purge_ctl = PURGE_ALL; 560 cp210x_set_config(port, CP210X_PURGE, &purge_ctl, 2); 561 562 cp210x_set_config_single(port, CP210X_IFC_ENABLE, UART_DISABLE); 563 } 564 565 /* 566 * Read how many bytes are waiting in the TX queue. 567 */ 568 static int cp210x_get_tx_queue_byte_count(struct usb_serial_port *port, 569 u32 *count) 570 { 571 struct usb_serial *serial = port->serial; 572 struct cp210x_port_private *port_priv = usb_get_serial_port_data(port); 573 struct cp210x_comm_status *sts; 574 int result; 575 576 sts = kmalloc(sizeof(*sts), GFP_KERNEL); 577 if (!sts) 578 return -ENOMEM; 579 580 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 581 CP210X_GET_COMM_STATUS, REQTYPE_INTERFACE_TO_HOST, 582 0, port_priv->bInterfaceNumber, sts, sizeof(*sts), 583 USB_CTRL_GET_TIMEOUT); 584 if (result == sizeof(*sts)) { 585 *count = le32_to_cpu(sts->ulAmountInOutQueue); 586 result = 0; 587 } else { 588 dev_err(&port->dev, "failed to get comm status: %d\n", result); 589 if (result >= 0) 590 result = -EPROTO; 591 } 592 593 kfree(sts); 594 595 return result; 596 } 597 598 static bool cp210x_tx_empty(struct usb_serial_port *port) 599 { 600 int err; 601 u32 count; 602 603 err = cp210x_get_tx_queue_byte_count(port, &count); 604 if (err) 605 return true; 606 607 return !count; 608 } 609 610 /* 611 * cp210x_get_termios 612 * Reads the baud rate, data bits, parity, stop bits and flow control mode 613 * from the device, corrects any unsupported values, and configures the 614 * termios structure to reflect the state of the device 615 */ 616 static void cp210x_get_termios(struct tty_struct *tty, 617 struct usb_serial_port *port) 618 { 619 unsigned int baud; 620 621 if (tty) { 622 cp210x_get_termios_port(tty->driver_data, 623 &tty->termios.c_cflag, &baud); 624 tty_encode_baud_rate(tty, baud, baud); 625 } else { 626 unsigned int cflag; 627 cflag = 0; 628 cp210x_get_termios_port(port, &cflag, &baud); 629 } 630 } 631 632 /* 633 * cp210x_get_termios_port 634 * This is the heart of cp210x_get_termios which always uses a &usb_serial_port. 635 */ 636 static void cp210x_get_termios_port(struct usb_serial_port *port, 637 unsigned int *cflagp, unsigned int *baudp) 638 { 639 struct device *dev = &port->dev; 640 unsigned int cflag, modem_ctl[4]; 641 unsigned int baud; 642 unsigned int bits; 643 644 cp210x_get_config(port, CP210X_GET_BAUDRATE, &baud, 4); 645 646 dev_dbg(dev, "%s - baud rate = %d\n", __func__, baud); 647 *baudp = baud; 648 649 cflag = *cflagp; 650 651 cp210x_get_line_ctl(port, &bits); 652 cflag &= ~CSIZE; 653 switch (bits & BITS_DATA_MASK) { 654 case BITS_DATA_5: 655 dev_dbg(dev, "%s - data bits = 5\n", __func__); 656 cflag |= CS5; 657 break; 658 case BITS_DATA_6: 659 dev_dbg(dev, "%s - data bits = 6\n", __func__); 660 cflag |= CS6; 661 break; 662 case BITS_DATA_7: 663 dev_dbg(dev, "%s - data bits = 7\n", __func__); 664 cflag |= CS7; 665 break; 666 case BITS_DATA_8: 667 dev_dbg(dev, "%s - data bits = 8\n", __func__); 668 cflag |= CS8; 669 break; 670 case BITS_DATA_9: 671 dev_dbg(dev, "%s - data bits = 9 (not supported, using 8 data bits)\n", __func__); 672 cflag |= CS8; 673 bits &= ~BITS_DATA_MASK; 674 bits |= BITS_DATA_8; 675 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 676 break; 677 default: 678 dev_dbg(dev, "%s - Unknown number of data bits, using 8\n", __func__); 679 cflag |= CS8; 680 bits &= ~BITS_DATA_MASK; 681 bits |= BITS_DATA_8; 682 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 683 break; 684 } 685 686 switch (bits & BITS_PARITY_MASK) { 687 case BITS_PARITY_NONE: 688 dev_dbg(dev, "%s - parity = NONE\n", __func__); 689 cflag &= ~PARENB; 690 break; 691 case BITS_PARITY_ODD: 692 dev_dbg(dev, "%s - parity = ODD\n", __func__); 693 cflag |= (PARENB|PARODD); 694 break; 695 case BITS_PARITY_EVEN: 696 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 697 cflag &= ~PARODD; 698 cflag |= PARENB; 699 break; 700 case BITS_PARITY_MARK: 701 dev_dbg(dev, "%s - parity = MARK\n", __func__); 702 cflag |= (PARENB|PARODD|CMSPAR); 703 break; 704 case BITS_PARITY_SPACE: 705 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 706 cflag &= ~PARODD; 707 cflag |= (PARENB|CMSPAR); 708 break; 709 default: 710 dev_dbg(dev, "%s - Unknown parity mode, disabling parity\n", __func__); 711 cflag &= ~PARENB; 712 bits &= ~BITS_PARITY_MASK; 713 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 714 break; 715 } 716 717 cflag &= ~CSTOPB; 718 switch (bits & BITS_STOP_MASK) { 719 case BITS_STOP_1: 720 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 721 break; 722 case BITS_STOP_1_5: 723 dev_dbg(dev, "%s - stop bits = 1.5 (not supported, using 1 stop bit)\n", __func__); 724 bits &= ~BITS_STOP_MASK; 725 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 726 break; 727 case BITS_STOP_2: 728 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 729 cflag |= CSTOPB; 730 break; 731 default: 732 dev_dbg(dev, "%s - Unknown number of stop bits, using 1 stop bit\n", __func__); 733 bits &= ~BITS_STOP_MASK; 734 cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2); 735 break; 736 } 737 738 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 739 if (modem_ctl[0] & 0x0008) { 740 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 741 cflag |= CRTSCTS; 742 } else { 743 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 744 cflag &= ~CRTSCTS; 745 } 746 747 *cflagp = cflag; 748 } 749 750 /* 751 * CP2101 supports the following baud rates: 752 * 753 * 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 14400, 19200, 28800, 754 * 38400, 56000, 57600, 115200, 128000, 230400, 460800, 921600 755 * 756 * CP2102 and CP2103 support the following additional rates: 757 * 758 * 4000, 16000, 51200, 64000, 76800, 153600, 250000, 256000, 500000, 759 * 576000 760 * 761 * The device will map a requested rate to a supported one, but the result 762 * of requests for rates greater than 1053257 is undefined (see AN205). 763 * 764 * CP2104, CP2105 and CP2110 support most rates up to 2M, 921k and 1M baud, 765 * respectively, with an error less than 1%. The actual rates are determined 766 * by 767 * 768 * div = round(freq / (2 x prescale x request)) 769 * actual = freq / (2 x prescale x div) 770 * 771 * For CP2104 and CP2105 freq is 48Mhz and prescale is 4 for request <= 365bps 772 * or 1 otherwise. 773 * For CP2110 freq is 24Mhz and prescale is 4 for request <= 300bps or 1 774 * otherwise. 775 */ 776 static void cp210x_change_speed(struct tty_struct *tty, 777 struct usb_serial_port *port, struct ktermios *old_termios) 778 { 779 u32 baud; 780 781 baud = tty->termios.c_ospeed; 782 783 /* This maps the requested rate to a rate valid on cp2102 or cp2103, 784 * or to an arbitrary rate in [1M,2M]. 785 * 786 * NOTE: B0 is not implemented. 787 */ 788 baud = cp210x_quantise_baudrate(baud); 789 790 dev_dbg(&port->dev, "%s - setting baud rate to %u\n", __func__, baud); 791 if (cp210x_set_config(port, CP210X_SET_BAUDRATE, &baud, 792 sizeof(baud))) { 793 dev_warn(&port->dev, "failed to set baud rate to %u\n", baud); 794 if (old_termios) 795 baud = old_termios->c_ospeed; 796 else 797 baud = 9600; 798 } 799 800 tty_encode_baud_rate(tty, baud, baud); 801 } 802 803 static void cp210x_set_termios(struct tty_struct *tty, 804 struct usb_serial_port *port, struct ktermios *old_termios) 805 { 806 struct device *dev = &port->dev; 807 unsigned int cflag, old_cflag; 808 unsigned int bits; 809 unsigned int modem_ctl[4]; 810 811 cflag = tty->termios.c_cflag; 812 old_cflag = old_termios->c_cflag; 813 814 if (tty->termios.c_ospeed != old_termios->c_ospeed) 815 cp210x_change_speed(tty, port, old_termios); 816 817 /* If the number of data bits is to be updated */ 818 if ((cflag & CSIZE) != (old_cflag & CSIZE)) { 819 cp210x_get_line_ctl(port, &bits); 820 bits &= ~BITS_DATA_MASK; 821 switch (cflag & CSIZE) { 822 case CS5: 823 bits |= BITS_DATA_5; 824 dev_dbg(dev, "%s - data bits = 5\n", __func__); 825 break; 826 case CS6: 827 bits |= BITS_DATA_6; 828 dev_dbg(dev, "%s - data bits = 6\n", __func__); 829 break; 830 case CS7: 831 bits |= BITS_DATA_7; 832 dev_dbg(dev, "%s - data bits = 7\n", __func__); 833 break; 834 case CS8: 835 bits |= BITS_DATA_8; 836 dev_dbg(dev, "%s - data bits = 8\n", __func__); 837 break; 838 /*case CS9: 839 bits |= BITS_DATA_9; 840 dev_dbg(dev, "%s - data bits = 9\n", __func__); 841 break;*/ 842 default: 843 dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n"); 844 bits |= BITS_DATA_8; 845 break; 846 } 847 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 848 dev_dbg(dev, "Number of data bits requested not supported by device\n"); 849 } 850 851 if ((cflag & (PARENB|PARODD|CMSPAR)) != 852 (old_cflag & (PARENB|PARODD|CMSPAR))) { 853 cp210x_get_line_ctl(port, &bits); 854 bits &= ~BITS_PARITY_MASK; 855 if (cflag & PARENB) { 856 if (cflag & CMSPAR) { 857 if (cflag & PARODD) { 858 bits |= BITS_PARITY_MARK; 859 dev_dbg(dev, "%s - parity = MARK\n", __func__); 860 } else { 861 bits |= BITS_PARITY_SPACE; 862 dev_dbg(dev, "%s - parity = SPACE\n", __func__); 863 } 864 } else { 865 if (cflag & PARODD) { 866 bits |= BITS_PARITY_ODD; 867 dev_dbg(dev, "%s - parity = ODD\n", __func__); 868 } else { 869 bits |= BITS_PARITY_EVEN; 870 dev_dbg(dev, "%s - parity = EVEN\n", __func__); 871 } 872 } 873 } 874 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 875 dev_dbg(dev, "Parity mode not supported by device\n"); 876 } 877 878 if ((cflag & CSTOPB) != (old_cflag & CSTOPB)) { 879 cp210x_get_line_ctl(port, &bits); 880 bits &= ~BITS_STOP_MASK; 881 if (cflag & CSTOPB) { 882 bits |= BITS_STOP_2; 883 dev_dbg(dev, "%s - stop bits = 2\n", __func__); 884 } else { 885 bits |= BITS_STOP_1; 886 dev_dbg(dev, "%s - stop bits = 1\n", __func__); 887 } 888 if (cp210x_set_config(port, CP210X_SET_LINE_CTL, &bits, 2)) 889 dev_dbg(dev, "Number of stop bits requested not supported by device\n"); 890 } 891 892 if ((cflag & CRTSCTS) != (old_cflag & CRTSCTS)) { 893 cp210x_get_config(port, CP210X_GET_FLOW, modem_ctl, 16); 894 dev_dbg(dev, "%s - read modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 895 __func__, modem_ctl[0], modem_ctl[1], 896 modem_ctl[2], modem_ctl[3]); 897 898 if (cflag & CRTSCTS) { 899 modem_ctl[0] &= ~0x7B; 900 modem_ctl[0] |= 0x09; 901 modem_ctl[1] = 0x80; 902 dev_dbg(dev, "%s - flow control = CRTSCTS\n", __func__); 903 } else { 904 modem_ctl[0] &= ~0x7B; 905 modem_ctl[0] |= 0x01; 906 modem_ctl[1] |= 0x40; 907 dev_dbg(dev, "%s - flow control = NONE\n", __func__); 908 } 909 910 dev_dbg(dev, "%s - write modem controls = 0x%.4x 0x%.4x 0x%.4x 0x%.4x\n", 911 __func__, modem_ctl[0], modem_ctl[1], 912 modem_ctl[2], modem_ctl[3]); 913 cp210x_set_config(port, CP210X_SET_FLOW, modem_ctl, 16); 914 } 915 916 } 917 918 static int cp210x_tiocmset(struct tty_struct *tty, 919 unsigned int set, unsigned int clear) 920 { 921 struct usb_serial_port *port = tty->driver_data; 922 return cp210x_tiocmset_port(port, set, clear); 923 } 924 925 static int cp210x_tiocmset_port(struct usb_serial_port *port, 926 unsigned int set, unsigned int clear) 927 { 928 unsigned int control = 0; 929 930 if (set & TIOCM_RTS) { 931 control |= CONTROL_RTS; 932 control |= CONTROL_WRITE_RTS; 933 } 934 if (set & TIOCM_DTR) { 935 control |= CONTROL_DTR; 936 control |= CONTROL_WRITE_DTR; 937 } 938 if (clear & TIOCM_RTS) { 939 control &= ~CONTROL_RTS; 940 control |= CONTROL_WRITE_RTS; 941 } 942 if (clear & TIOCM_DTR) { 943 control &= ~CONTROL_DTR; 944 control |= CONTROL_WRITE_DTR; 945 } 946 947 dev_dbg(&port->dev, "%s - control = 0x%.4x\n", __func__, control); 948 949 return cp210x_set_config(port, CP210X_SET_MHS, &control, 2); 950 } 951 952 static void cp210x_dtr_rts(struct usb_serial_port *p, int on) 953 { 954 if (on) 955 cp210x_tiocmset_port(p, TIOCM_DTR|TIOCM_RTS, 0); 956 else 957 cp210x_tiocmset_port(p, 0, TIOCM_DTR|TIOCM_RTS); 958 } 959 960 static int cp210x_tiocmget(struct tty_struct *tty) 961 { 962 struct usb_serial_port *port = tty->driver_data; 963 unsigned int control; 964 int result; 965 966 cp210x_get_config(port, CP210X_GET_MDMSTS, &control, 1); 967 968 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 969 |((control & CONTROL_RTS) ? TIOCM_RTS : 0) 970 |((control & CONTROL_CTS) ? TIOCM_CTS : 0) 971 |((control & CONTROL_DSR) ? TIOCM_DSR : 0) 972 |((control & CONTROL_RING)? TIOCM_RI : 0) 973 |((control & CONTROL_DCD) ? TIOCM_CD : 0); 974 975 dev_dbg(&port->dev, "%s - control = 0x%.2x\n", __func__, control); 976 977 return result; 978 } 979 980 static void cp210x_break_ctl(struct tty_struct *tty, int break_state) 981 { 982 struct usb_serial_port *port = tty->driver_data; 983 unsigned int state; 984 985 if (break_state == 0) 986 state = BREAK_OFF; 987 else 988 state = BREAK_ON; 989 dev_dbg(&port->dev, "%s - turning break %s\n", __func__, 990 state == BREAK_OFF ? "off" : "on"); 991 cp210x_set_config(port, CP210X_SET_BREAK, &state, 2); 992 } 993 994 static int cp210x_port_probe(struct usb_serial_port *port) 995 { 996 struct usb_serial *serial = port->serial; 997 struct usb_host_interface *cur_altsetting; 998 struct cp210x_port_private *port_priv; 999 int ret; 1000 1001 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 1002 if (!port_priv) 1003 return -ENOMEM; 1004 1005 cur_altsetting = serial->interface->cur_altsetting; 1006 port_priv->bInterfaceNumber = cur_altsetting->desc.bInterfaceNumber; 1007 1008 usb_set_serial_port_data(port, port_priv); 1009 1010 ret = cp210x_detect_swapped_line_ctl(port); 1011 if (ret) { 1012 kfree(port_priv); 1013 return ret; 1014 } 1015 1016 return 0; 1017 } 1018 1019 static int cp210x_port_remove(struct usb_serial_port *port) 1020 { 1021 struct cp210x_port_private *port_priv; 1022 1023 port_priv = usb_get_serial_port_data(port); 1024 kfree(port_priv); 1025 1026 return 0; 1027 } 1028 1029 module_usb_serial_driver(serial_drivers, id_table); 1030 1031 MODULE_DESCRIPTION(DRIVER_DESC); 1032 MODULE_LICENSE("GPL"); 1033